What color is #040F0B?

#040F0B is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(4, 15, 11), and in HSL hsl(158, 58%, 4%).

Is #040F0B accessible as text?

On white, #040F0B has a contrast ratio of 19.47:1 (passes WCAG AA for body text); on black it is 1.08:1 (fails). For text placed on #040F0B, use white for the best readability.

What is the closest Tailwind color to #040F0B?

The nearest Tailwind CSS token is neutral-950 (#0A0A0A).

What colors go well with #040F0B?

As a neutral, #040F0B pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #040F0B the same as CSS black?

No — #040F0B is not the CSS named color black, but black (#000000) is the closest CSS named color.

#040F0B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040F0B

Not just a swatch — here's how #040F0B works with other colors. Named schemes with #040F0B in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #040F0B Surface #14161A Highlight #F4F6F8 Secondary #586771 Accent #1F2B26

Jet Black is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Jet Black.

Vintage Leather Lead · 5 colors

Lead #040F0B Secondary #734F19 Surface #E5DBC0 Accent #3B5141 Anchor #5B231F

Jet Black plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Japanese Sand Base · 5 colors

Base #040F0B Surface #EDEADC Highlight #F5F1E7 Secondary #B5B19F Ink #2A2723

Jet Black sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Luxury Packaging Feature · 5 colors

Feature #040F0B Anchor #141210 Accent #BCA84C Secondary #1F2C27 Surface #F1EDE3

Jet Black carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #040F0B Secondary #292E2C Support #989286 Ink #16140F

Jet Black is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Jet Black carrying the quiet middle.

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Color Lab

How #040F0B actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 47/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 18/100

Very low

Firm and assertive — carries weight and contrast.

Depth 79/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 18/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 18/100

Very low

Clean and current — no dusty, aged cast.

Luxury 78/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 8/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 5/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 69/100

High

Calm enough for large fills — backgrounds, cards, sections.

Print safety 96/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040F0B

For UI

For branding

For interior

For fashion

People also use #040F0B with

Sacramento Green Jet Black Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 19.5:1. Use

Subtle surface Use #BAE2D3 for cards and hover fills. Tint 80

Avoid beside #041010 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #040F0B at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #040F0B;
  --color-base-rgb: 4 15 11;
  --color-base-oklch: oklch(15.5% 0.020 170.8);
  --color-50: #F2FCF9;
  --color-100: #DEF7EE;
  --color-200: #BFEEDC;
  --color-300: #92DDC2;
  --color-400: #69C9A6;
  --color-500: #47AD88;
  --color-600: #3D856B;
  --color-700: #305F4E;
  --color-800: #233E34;
  --color-900: #172621;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F2FCF9',
    100: '#DEF7EE',
    200: '#BFEEDC',
    300: '#92DDC2',
    400: '#69C9A6',
    500: '#47AD88',
    600: '#3D856B',
    700: '#305F4E',
    800: '#233E34',
    900: '#172621',
  },
}

$base: #040F0B;
$base-ink: #FFFFFF;
$base-50: #F2FCF9;
$base-100: #DEF7EE;
$base-200: #BFEEDC;
$base-300: #92DDC2;
$base-400: #69C9A6;
$base-500: #47AD88;
$base-600: #3D856B;
$base-700: #305F4E;
$base-800: #233E34;
$base-900: #172621;
$base-hover: #030D09;
$base-subtle: #95D6BE;

{
    "color": {
        "base": {
            "value": "#040F0B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FCF9",
                "type": "color"
            },
            "100": {
                "value": "#DEF7EE",
                "type": "color"
            },
            "200": {
                "value": "#BFEEDC",
                "type": "color"
            },
            "300": {
                "value": "#92DDC2",
                "type": "color"
            },
            "400": {
                "value": "#69C9A6",
                "type": "color"
            },
            "500": {
                "value": "#47AD88",
                "type": "color"
            },
            "600": {
                "value": "#3D856B",
                "type": "color"
            },
            "700": {
                "value": "#305F4E",
                "type": "color"
            },
            "800": {
                "value": "#233E34",
                "type": "color"
            },
            "900": {
                "value": "#172621",
                "type": "color"
            }
        }
    }
}

Palettes built on #040F0B

Color Lab

Pairs with #040F0B

UI roles & guardrails

In real applications

Scales

Every model

Export